The first and last aren't release quality, IMO.
Yey
The second one looks good.
The textures along with the height map seem to give it a retail look.
Pewp
The first one is low quality and looks thrown together.
The last one has barely any room to build.
No offense, but i think we have enough terrain only maps.
We need some maps with flair and excitement.
If you need help with the interior exporting/etc. Let me know, Im glad to help you.